Why is the true mind also without marks?

原文：世尊。若复有人得闻是经。信心清净。则生实相。当知是人。成就第一希有功德。世尊。是实相者。即是非相。是故如来说名实相。

Explanation: Subhūti said: World-Honored One, if there are still other people who, after hearing this sūtra, give rise to great and pure faith, they will be able to discern what is the true mark and what are illusory false marks. Then it should be known that such a person has accomplished the foremost rare merit. World-Honored One, this so-called true mark is itself not a mark; therefore the Tathāgata calls it the true mark only provisionally.

Clearly, this so-called true mark is the wisdom-cognition that arises in those who hear the sūtra after their faith has become pure; it is realized wisdom. The wisdom that realizes the true mark is not the true mark itself. The true mark itself is the wisdom that neither arises nor ceases, neither increases nor decreases, and never changes, whereas the wisdom that discerns the true mark is subject to arising, ceasing, increase, and decrease; therefore it is not the true mark, not the originally existing true reality, and is only provisionally named the true mark. It should be called the wisdom of the true mark—the wisdom that arises upon realizing the true mark.

As for the true mark that originally exists, it is formless and without marks, without any worldly dharma-marks, without any marks of the six sense-object realms; it has always revealed itself to people as markless. Therefore it is also a non-mark. This non-mark vajra mind (Vajracitta) is also given the name "true mark," and by this name the true reality and the unborn, unceasing nature of the vajra mind are made manifest, so that sentient beings may recognize it and proclaim it.

After hearing this Diamond Sūtra, to be able to have pure faith, to have pure faith in this sūtra and in the vajra mind, and moreover to be able to realize the vajra mind—this is indeed accomplishing the foremost rare merit, and it is indeed rare and hard to attain; such a person's roots of goodness are extremely deep. When even the mark of realizing the vajra mind is broken through, and the mark of giving rise to the wisdom of the true mark is broken through, one will then not cling to the cultivation and realization of the Buddha-dharma as real, will not give rise to arrogance, will dispel all marks, and with a mind that is empty, pure, and tranquil, will swiftly reach the farther shore of nirvāṇa.